A new method for the biological assay of cardiotonic steroids based on the potentiation of potassium-contracture of the frog ventricular muscle.
D000818:Animals; D001001:Anura; D001681:Biological Assay; D002118:Calcium / Q000494:pharmacology; D002297:Cardanolides / Q000494:pharmacology*; D004357:Drug Synergism; D006352:Heart Ventricles / Q000187:drug effects*; D066298:In Vitro Techniques; D008722:Methods; D009119:Muscle Contraction / Q000187:drug effects*; D011188:Potassium / Q000494:pharmacology*
D002297:Cardanolides; D011188:Potassium; D002118:Calcium